Should a rating system be required for song lyrics?

I would say yes the rating system should be required for the song lyrics. Some of the song lyrics contain too much adult content which is not appropriate for the kid or sometime teenager. I think parent should check out on this to. They are so many in appropriate word in the song. I think by putting the rating system their would be better because parent can see what kid of music did their kid listen to and they can see if the song is appropriate for their age. In some song there contain so many aggressive word that is not good for kid to listen to. So I totally agree that rating system should be required for the song lyrics.